I have a 67 coupe with a 327 210 HP with a 2 barrel carb on it and I want to convert it to a 275HP with 4 barrel carb. My questions are what else is different on the outside of the motor? I do not know what air cleaner is correct, is it an open or closed element and how big and chrome or painted that this motor used? Also someone told me it would have had chrome valve covers on it, is this true? Are there any other changes that I should know about? Thanks and if anyone has any of the parts I will need for sale please E-mail Thanks.